Meanings of rearrange deck in English

I thought this is the Titanic, rearranging deck chairs.

However, all this is rearranging deck chairs on the Titanic because the subject is optional from 2015.

The montage included the FBI rearranging deck chairs on the Titanic as other mobsters experienced some, eh, difficulties.

Which leads us to the idea that.... It's rearranging deck chairs on the Titanic, because the economics of digital content are fundamentally broken.